Warm-air furnace.



J. V. BAILEY.

WARM AIR FURNACE. APPLICATION I'ILED DEC. 4, 1911.

Patented Oct. 29, 1912.

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JESSE V. BAILEY, OF- DETROIT, MICHIGA N, ASSIGNOR TO THE MICHIGAN STOVECOMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

Specification of Letters Patent.

Patented oer. 29, 19112.

Application filed December 4., 1911. Serial No. 663,677,

To all whom it may concern:

Be it known that 1, Jesse V. DAILEY, a

a full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appert-ains to make and usethe same, reference being had to the accompanying drawings, and to thecharacters of reference marked thereon, which form a part of thisspecification.

This invention relates to warm air furnaces and consists in' theconstruction and arrangement of parts hereinafter more fully set forthand pointed out particularly in the claims. v

The object of the invention is to provide simple and efiicient means forintroducing through suitable ducts an air blast into the combustionchamber over the top of the burning fuel in the fire pot, and the invention contemplates such disposition of said air duets with respect to thepath of travel of the products of combustion as will cause the productsof combustion on their way to the smoke pipe to pass around and oversaid.

ducts in/a manner to superheat the air before its entrance into thecombustion chamber.

The above object/is attained by the construction illustrated in theaccompanying drawings, in which:

Figure 1 is a perspective view of the combustion chamber and radiator ofa furnace embodying my invention, the fire pot being broken away and thecasing of the furnace being omitted. Fig. 2 is an enlarged fragmentaryview in section through the feed door opening of the furnace, andthrough the top of the tire pot, as on line 2-2 of Fig. 5, showing oneof the air ducts leading to the perforated ring at the top of the tirepot, and also showing the path of travel of the products of combustion,Fig. 3 is a sectional view through one of the air ducts, and through theperforated ring and a portion of the fire pot, as on line 3-3 of Fig. 5.Fig. i is a. central vertical section through the combustion chamber,radiator, and the upper portion of the fire pot, and through theperforated ring which forms the inner wall of an annular air chamber atthe top of the fire pot into which the air blast is directed. Fig. 5 isan enlarged frag1nentary view in horizontal section through the radiatorand through the annular air chamber above the fire pot, said sectionbeing taken through the feeddoor opening above the air ducts leadinginto said air chamber, Referring to the characters of reference, 1designates the fire pot which may be of any suitable construction, andwhich, at its upper edge, is provided with a channeled flange2. Seatedin the channeled flange of the fire pot is a perforated ring 3, and thelower annular section L of the combustion chamber, the complementaryportion of the combustion chamber being formed by a dome shaped section5 which rests upon and is supported by the lower section 4; Theperforated ring 3 is curved laterally so as to project inwardly andslightly overhang the top of the fire pot. By reason of the lateral ortransverse curvature of the perforated ring an annular air space 6 isformed between said ring and the lower section of the combustionchamber.per edge .of the perforated ring contacts theinner wall of thecombustion, chamber in a manner to prevent the escape of air from thechamber 6 atthat point, as clearly shown in Figs. 3 and 4. The'usualradiator 7 is employedatfording .the flue passages 8 for the products ofcombustion, which lead to the smoke pipe, not shown, as will be wellunderstood in the art. The feed opening is provided which communicatesin the usual way with the combustion chamber above the fire pot, thedoor for closing said opening being omitted. The arrangement is suchthat the products of combustion from the combustion chamber passoutwardly some distance. into the feed opening and thence into the fines8 leading to the smoke pipe.

The perforated ring 3 is an open ring, the

terminals of which bend outwardly, as

The upwhich terminates on each side of the feed opening. Below the feedopening are two air ducts 10 whose outer ends communicate with theatmosphere through a common opening 11, as shown in Fig. l, and whoseinner ends diverge and communicate with the air space or chamber 6 oneach side of the feed opening through upwardly extending terminals 12.The bottom 13 of the feed opening forms the top of the air ducts 10. forthe major portion thereof, While the upwardly inclined terminals 12 ofsaid ducts rise somewhat above said bottom of the feed openin By thisarrangement the -tire travel from the combustion chamber into the lines8 is around'the terminals 12 of the air ducts and over the tops of saidducts, whereby the air blast drawn into the air space 6 from said ductsby the circulation within the combustion chamber becomes superheated andis discharged through the perforations 14 in the ring 3 in the form of ahot blast which is projected over the top of the fire in the fire potand commingled with the products of combustion, whereby the gas andsmoke are consumed to a great extent, resulting in the extraction of agreater number of heat units from a glven quantity of fuel andincreasing the efficacy of the furnace.

In a furnace constructed as herein shown and described, the passage ofthe products of combustion from the combustion chamber will create apartial vacuum therein, causing a suction of air through the perforatedrin into the fire pot, and creating a strong iniiow of air through, theducts 10 into the air chamber (3, which inflowing air in passing .hroughsaid ducts becomes highly superheated as before explained. Thissuperheated air which passes into the combustion chamber from the airspace 6 through the perforations in the ring 3 at once mixes with thegases liberated from the burning coal, forming a combustible mix turewhich burns in jets of visible fltllltu from said perforations. Byintroducinga blast of superheated air into the combustion chamber overthe fuel, the gases liberated from the burning coal are not chilled, andoxygen is supplied in sutticient uantity to support combustion at apoint in the combustion chamber not ordinarily supplied with sutiicicntair to burn the liberated gases, whereby the smoke and gases areconsumed to a great extent, and the heat generated by the combustionthereof is utilized, while at the same time excessive smoke from theburning coal is obviated.

Having thus fully set forth my invention, what I claim as no and desireto secure by Letters Patent, is:--

1. A fire pot, an annula air space at the top of the fire pot, aperforated wall through which communication is established between saidair space and the fire pot, a fuel feed passage communicating with thetire pot betwecn'the terminals of said air space, a flue for theproducts of combustion communicating with said feed passage, and airducts communicating at their inner ends with the terminals of said airspace and open to atmosphere at their outer ends, said ducts beingdisposed below and adjacent the bottom of said feed passage whereby thefire travel from the fire pot through said passage to said line shall beover said air ducts.

2. In a furnace, a fire pot, a feed opening communicating with said firepot, a curved perforated ring located at the top of the fire pot andforming an annular air space which con'nnunicates with the top of thefire pot through the perforations therein, said ring having outwardlybent terminals which contact the wall of the combustion chamber 011 eachside of the point of communication of said feed opening with said firepot and close the terminals of said annular air space, a fine for theproducts of combustion communicating with said feed opening on oppositesides thereof, and air ducts communicating at their inner ends with theterminals of said annular respectively, and open at their outer ends toatmosphere, said ducts lying below and adjacent the bottom of said feedopening whereby the travel of the products of combustion from thecombustion chamber to said flue shall be over said air ducts.

3. In a furnace, a combustion chamber, a

' fire-pot having a channel in its upper edge,

a laterally curved perforated ring seated at its lower edge in saidchannel and at its upper edge contacting the wall of the com-- bustionchamber to form an annular air space, the terminals of said ring beingbent into contact with the wall of the 'combustion chamber to close theends'of said air space, a feed opening connnunicating with the tire otbetween the terminals of said ring, a i no for the products ofcombustion communicating with the feed opening on opposite sidesthereof, and air ducts whose upper walls are formed by the bottom of thefeed opening conm'umicating at their inner ends with the terminals ofsaid. air space respectively, and open at their outer ends toatmosphere, whereby the path of travel of the products of combustion tosaid flue through said feed opening shall be over said air ducts.

4. A fire pot, an annular air space at the top of the fire pot havingspaced terminals, means for effecting communication between the tire potand said air space. a horizontal feed passage communicating with thetire pot between the terminals of said air space, a line for the produts of combustion communicating with said passage, and air ductscomnmnicating at their inner ends with the air space I through saidpassage JESSE V. DAILEY.

terminals of said air space respectively, and open at their outer endsto utn10sphere,said i ducts being disposed adjacent the bottom' of thefeed passage whereby the travel of the products of combustion from thefire pot to said flue shall be \Vitnesses J. OTTO BAENZIGER,

over said duets. M. E. BROESAMLE.

